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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
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<body>
    <ul class="ems">
        <li>One</li>
        <li>Two</li>
        <li>Three
          <ul>
            <li>Three A</li>
            <li>Three B
              <ul>
                <li>Three B 2</li>
              </ul>
            </li>
          </ul>
        </li>
      </ul>
      
      <ul class="rems">
        <li>One</li>
        <li>Two</li>
        <li>Three
          <ul>
            <li>Three A</li>
            <li>Three B
              <ul>
                <li>Three B 2</li>
              </ul>
            </li>
          </ul>
        </li>
      </ul>
</body>
</html>